If this is the wrong place to ask, I apologize and please direct me to the right place. Common sense arguments are welcome.
My house has 1920s era doors with crystal door knobs example here: https://s-media-cache-ak0.pinimg.com/736x/ac/8b/c4/ac8bc45b7ec7415478fb315ff326696a--crystal-knobs-glass-door-knobs.jpg
The door in my home is in far worse shape than the picture above. The knob and key are actually one piece built into the door frame. The key mechanism in the door is beyond repair and it cannot be replaced, this door does not lock.
I have installed a deadbolt similar to this: http://ecx.images-amazon.com/images/I/41vaXTd1sBL._SY300_QL70_.jpg
It blends in nicely with the color of the door.
Will this decrease the value of the home? Are 1920s era doors a selling point for home buyers?
Personally, I think a bathroom door that locks would be more important to a home buyer than the antique appearance of the door (especially considering the classic door has a broken key mechanism that is beyond repair).
If you have hard stats from surveys of home-buyers, that would be great, but I'm also open to general comments. Thanks.